functions_replay_call

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden. It usefully discloses the return shape (outcome, status, response body, new call id) and that the original request/event is reused, but it does not warn that replay re-executes side effects or whether the original call record is altered — important for a mutation tool with zero annotation coverage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single well-formed sentence that front-loads the action and appends the return info. No filler, though the trailing clause about the returned id is slightly dense.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a two-parameter tool with no output schema, the description compensates by naming the fields returned and pointing to functions_get_call for follow-up. The main remaining gap is behavioral: side-effect and idempotency implications of replaying are unstated.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so both the id and maxBodyChars parameters are already documented in the schema. The description adds only the implicit note that the payload comes from the recorded call rather than a parameter; baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource: re-run a recorded function call with the original request or event. It also names the follow-up sibling (functions_get_call) for retrieving the result. It does not distinguish itself from functions_invoke, which an agent could easily confuse with replay.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The phrase 'after a fix, say' implies the usage context (replaying once a bug or config issue is corrected), but there is no explicit guidance on when to use this versus functions_invoke or eventarc_replay_event, and no exclusions or prerequisites are given.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.